Abstract:
The increased demand for high power density converters resulted in increased EMI. This is addressed by considering all the converter parasitics along the noise propagation path.
In this paper, the analytical approach for common mode (CM)
noise analysis of dual active bridge (DAB) converter is presented.
The dv/dt of CM voltage that excites the parasitic capacitances
are the main source of CM noise. This CM noise is analysed by
calculating the change in CM voltage from one state to another
state for single phase shift technique (SPST) measured at LISN
terminals. The CM noise for symmetrical and asymmetrical
inductor and parasitic capacitors are also analysed using this
approach. The analysis is thoroughly verified in LTspice with
the parasitics measured from the hardware prototype.
